Engine.



F. MILLER.

ENGINE.

APPL-lcATloN Flu-:n huma. |915.

l 9 l 'Y l Patented Mar. 28, 1916.

Y I To all whom t concern:

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\ arrienrnnnz MILLER., or Minen', ira-LY.

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Be it known that I, FRANZ MILLER, a sub- Y ject of the King of Italy,residing at Milan,

have invented certain new and useful Italy of which the 'fol-Imprvements in Engines,

-lowing is a specification.l

,This invention relates to engines in which the transmission of thereciprocation of pistons into rotary motion of the driving shaft isobtained by means of one or more undulated or cam guides or grooves onwhich the pistons act, and has for its object a type of enginecomprising two or more independent pistons, which have differentlstrokes so'that the expansion qfthe fluid may be fully, utilized in thecasehihe engine isoperated byiuid under pressurem One constructiongjbfengine according to this invention is shown in the annexed drawing, saidengine comprising one or more sets of coaxial and annular cylinders.

As shown in said drawing, the annular cylinders are formed-by an outerwall 1 and an inner'pipe 2 inwhich the driving shaft 3 is mounted. Thewall 4 separates the chambers of cylinders 5 and 5' from each other, andsaid cylinders are further closed at their ends by the front walls 6,6.` In said cylinders 5, 5', the independent pistons 7 and 7 aremounted, which are connected -by means of rods 8, 8 passing throughwalls 6 and 4, with rings 9, 9 each comprising a set of rollers 10, 10respectively. Said rollers are engaged in undulated or cam grooves (onefor each set of rollers) provided in the sleeve 11 solid with thedriving shaft 3. e

'Ihe base of the engine is provided with on which bear rollers 13, 13',pivoted on the rings 9, 9', so that these rings may travellongitudinally but are prevented from rotating.

The pistons 7 and 7 being independent from each other may be caused tomake strokes having different lengths by giving diderenty heights to theundulations of the cam grooves of sleeve 11 engaged by rollers 1G and10. In this case the expansion of the driving duid may be fully utilizedby directing said 'iuid in cylinder 5 after it has acted in cylinder 5owing to the fact vthat the required ratio between the volumes ofcylinders 5 and 5 may be obtained by giving a longer stroke to thepiston 7 so that it is not required to increase exceedingly the diameterof the corresponding cylinder.

`regard to each lother or by an Specication of Letter-erstens. PatigndMmm, '19th-wn.

Application filed` August 23, 1915. Seria1No.46,922.

other, it is also possible to eliminate the dead centers in theoperation of the engine by angularly displacing the cam grooves'withgularly' displacing the line of thrust of rollers 10, 10.

engaging the same cam groove or diderent cam grooves having the sameangular posit-ion. In this case, by way of example, when the high`pressure piston has reached the end of its stroke, the low pressurepiston is still actuating the driving shaft, a further portion of stro ehaving to be made by" it.

In the case the strokes made by the pistons are different from eachother, andthe'member providing the cam grooves or'guides for the rollersis in form of a cylindrical sleeve, it is advisable to provide thegroove or 'de having the smaller wave height in the inner`- Wall of thesleeve while the groove or guide having the larger wave height is madein the outer surface, this latter being not confined by the spokes ordisk connecting said sleeve. with the driving shaft. This is thel caseshown in the drawing, the engine illuscylinders are symmetrical to that5 and 5 and operate cam grooves eachjof which is symmetrical to thecorresponding one.

By means of the described arrangement an engine is obtained in which thedriving,

`lines angularly displaced with regard to each other in order'toeliminate the dead centers.

v What I claim as my invention and desire to secure by U. S. LettersPatent is 1. In an engine having two or more coaxial cylinders and inwhich the transmission of reciprocation of the pistons into rotarymotion of the shaft is edected by means of undulated members, anindependent piston in each cylinder, a member solid with the drivingshaft provided with independent undulated members having dierent waveheights and means for transmitting the thrust of each piston to one ofsaid undulated members.

2. In an engine having two or more coaxial cylinders and in which thetransmission of reciprocation of the pistons into r0- trated beingfurther balanced owing to the fact that the pistons reciprocating inthev ton in each cylinder, a sleeve solid with thel driving shaftprovided with undulated membershaving a given wave height on its outersurface and a different height on the inner surface, and means fortransmitting the thrust of each piston to one of said undulated members.

3. In an engine having two or more coaxial cylinders and in which thetransmission of reciprocation of the pistons into rotary motion of thedriving shaft is effected by means of undulated members, an independentpiston in each cylinder, a sleeve solid with` the driving shaft,undulated grooves having a given wave height-in the outer surface ofsaid sleeve, undulated grooves having different wave height in the innersurface of said sleeve, sets of rollers the rollers of each set beingengaged in one of said grooves and pivoted on a ring, means for guidingthe travel ofsaid rings, and means for connecting each ring to thecorresponding piston. f

4. In an engine having two or more coaxial cylinders and in which thetransformation of reciprocation of pistons into rotary motion of theshaft is effected by means of' undulated members, an independent pistonin each cylinder, a part solid with the driving shaft, undulated membershaving different wave height and angularly displaced with regard to eachother in said part, and means for transmitting to each of said undulatedmembers the thrust of each piston. 4 i.

5. In an engine having two or more coaxial cylinders and in which thetransformation of reciprocation of pistons into rotary motion of thedriving shaft is effected by means of undulated members, an independentpiston in each cylinder, a sleeve solid with the driving shaft,undulated grooves in the outer surface of the'sleeve,

undulatedgrooves in the inner surface of said sleeve having dierentundulation and angularly displaced with regard to the outer ones, setsof rollers the rollers of each set being engaged in one of said groovesand pivoted on a ring, means for guiding the travel of said rings, andmeans for connecting each ring to the corresponding piston.

6. In an engine having one `or more pairs of coaxial cylinders and inwhich the transformation of reciprocation of pistons into rotary motionof the driving shaft is effect- -ed by means of undulated members,independent pistons each arranged opposite to another one, a part solidwith the driving shaft, independent undulated members in said part, eachsymmetrical to another one, undulated members in said part eachsymmetrical to another one having different undulations and angularlydisplaced with regard to the rst named undulated members and means fortransmitting to each pair of symmetrical undulated members the thrust oftwo opposite pistons. v

In testimony whereof I afiix my signature in presence of two witnesses.

FRANZ MILLER. Witnesses JOHN MARGH, FRANCISCO MARGH.

